Claus has appeared on numerous albums over the last 20 years, on many of which he was invited as an arranger and composer. To the left are just some of his appearences on albums of recent years.
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FESTIVALS:
Montreaux Jazzfetival, Switzerland, (1989), Vienna Jazzfestival, Austria (1991), Wiener Grabenfest, Vienna, Austria (1994), Dubrovnik Cultural Festival, Croatia (1995 and 1996), Aspen Jazz, Aspen, Colorado (1999), International Jazz Week Burghausen, Germany (2003), Generations, Switzerland (2004) and many others.

-TELEVISION APPEREANCES:
Eurovision Grand Opening of the Viennese Mozart Fest - Austrian Public TV
with Mark Murphy - Austrian Public TV
Lindenstrasse (weakly Soap Opera) - 1st. German Public TV
Live concerts on BRalpha-German TV, Croatian Public TV, Serbian Public TV, Slovakian Public TV as well as private stations.

-RADIO PROGRAM APPEARANCES:
Has performed on numerous national public radio programs in Austria, Germany, France, Switzerland, Slovenia, Croatia, Serbia as well as many local stations in variuous European cities.